Navigation system



FIG. 1 is a perspective view of front, top and right side of a navigation system showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown are included for the purpose of illustrating the unclaimed portions of a navigation system and form no part of the claimed design. 

CLAIM The ornamental design for a navigation system, as shown and described. 